275/40R23 tire size
275/40R23 is a metric size: 31.7" tall, 10.8" wide, on a 23" rim — about a 31.5x11.00R23. The sidewall is 4.3" and the tire turns 637 times per mile.
275/40R23 specs
| Overall diameter (height) | 31.66" · 804 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 4.33" · 110 mm (40% of width) |
| Rim diameter | 23" |
| Circumference | 99.47" · 2.526 m |
| Revolutions per mile | 637 (396 per km) |
| Inch (flotation) equivalent | 31.5x11.00R23 |
Equivalent sizes on a 23" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 285/40R23 | 31.98" | +0.99% | +10 mm | 60.6 mph | calculate → |
| 285/35R23 | 30.85" | -2.55% | +10 mm | 58.5 mph | calculate → |
| 295/35R23 | 31.13" | -1.68% | +20 mm | 59.0 mph | calculate → |
| 325/35R23 | 31.96" | +0.93% | +50 mm | 60.6 mph | calculate → |
| 305/40R23 | 32.61" | +2.98% | +30 mm | 61.8 mph | calculate → |
| 305/35R23 | 31.41" | -0.81% | +30 mm | 59.5 mph | calculate → |
| 255/40R23 | 31.03" | -1.99% | -20 mm | 58.8 mph | calculate → |
| 335/30R23 | 30.91" | -2.36% | +60 mm | 58.6 mph | calculate → |
Try another size against 275/40R23
Questions
What size is 275/40R23 in inches?
275/40R23 is about 31.7" tall and 10.8" wide on a 23-inch rim — roughly a 31.5x11.00R23 in inch sizing.
What does 275/40R23 mean?
275 mm section width, sidewall 40% of the width (4.33"), radial construction, 23-inch rim.
What tire sizes are equivalent to 275/40R23?
On the same 23" rim, within 3% of the diameter: 305/35R23 (-0.81%), 325/35R23 (+0.93%), 285/40R23 (+0.99%), 295/35R23 (-1.68%), 255/40R23 (-1.99%), 335/30R23 (-2.36%).
How many revolutions per mile does a 275/40R23 tire make?
About 637 revolutions per mile (circumference 99.5").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.